Pool Light Replacement and Bonding Verification
Purpose
Changing a lamp is the easy part of this job and it is not why the procedure exists. The wet niche is the one place on a pool where a wiring or bonding defect puts a person in the water directly into a current path, so this procedure guarantees the pool is cleared before the work starts, the circuit is proved dead at the deck box rather than assumed off at a switch, the niche bond is verified before the fixture goes back, and the GFCI is proved working after. The failure it stops is ordinary and fatal: a technician relamps a fixture, screws it back in, flips the breaker, and never learns that the bonding conductor behind the niche rotted off years ago.
If anyone has reported a tingle, a shock or a buzzing sensation in the water, this is not a lamp call. Everyone out of the water and off the wet deck immediately, nobody re-enters, kill power to every pool circuit at the panel, and the pool stays closed until a licensed electrician has investigated. Do not relamp your way past that report.
Scope
Covers relamping or replacing a wet-niche or no-niche luminaire in a residential or light commercial pool or spa, including the bonding and GFCI verification either side of the work.
It does not cover the branch circuit, the deck box installation, the conduit run, the bonding network itself or any repair to it, all of which are a licensed electrician's work under your jurisdiction's rules. It does not define the equipotential bonding network or its acceptance, which the pump and motor replacement SOP owns and which this procedure applies unchanged. Landscape and deck lighting outside the pool's zone are a different job.
Roles and responsibilities
| Role | Owns | Hands off |
|---|---|---|
| Service technician | Clearing the water, isolation and proving dead, the fixture, niche bond inspection, GFCI verification | Hands over a written before-and-after GFCI result and the niche bond condition, not "light works" |
| Licensed electrician | Branch circuit, deck box, conduit, bonding conductor and lug repairs | Returns the niche with a stated continuity result in writing before the fixture goes back in |
| Shop lead | The stop-the-swim call, customer notification when a pool is left with the light locked out | Confirms the customer was told in writing the same day a light was left dead |
What the niche actually requires
Article 680 of the NEC, in the edition your jurisdiction has adopted, governs this work, and four of its requirements decide whether a fixture may go back in.
GFCI protection is required for underwater luminaires operating above the low-voltage contact limit. That limit and the exact wording have moved between editions, so read the adopted edition rather than a remembered figure, and treat a GFCI that will not trip on its own test button as a failed device, not a nuisance.
The equipotential bond reaches the niche shell like every other metal part around the water. Its size, material and acceptance are stated in the pump and motor replacement SOP: a listed, mechanically sound connection on a clean lug plus a verified continuous path. There is no resistance value in the NEC for a pool bond, so do not write an invented ohm figure on a ticket.
The cord length exists so the fixture can be lifted onto the deck for servicing without tension on the conductors. A fixture that will not reach the deck has had its cord shortened by someone, and a shortened or spliced cord is no longer the listed assembly. That is a fixture replacement, not a repair.
The deck box has a required height above the water and distance from the pool wall in the adopted edition. You are not installing it, but you are looking at it every time you prove dead, and a deck box sitting in a puddle is a finding the customer needs in writing.
One rule sits outside the code and is absolute in practice: never energize an underwater fixture that is out of the water. These fixtures are cooled by the water around them, and a lamp fired on the deck to "check it" cracks the lens, cooks the gasket, or burns a hand.
Procedure
Clear the pool and the wet deck, and keep them clear until the work is signed off. Accept when nobody is in the water or on the wet coping, the customer knows why, and the area is coned or roped for the duration. Wrong is a homeowner's assurance that the kids will stay out. Stop rule: if anyone reports a shock or tingle in the water, this procedure does not run - everyone stays out, all pool circuits go off at the panel, and the pool is closed pending a licensed electrician.
With the circuit still on, record the arrival state. Press the GFCI test button and confirm it trips and resets, note whether the light operates, and ask about any breaker or GFCI trip history. Accept when a trip-and-reset result and a light-operates result are on the ticket. Wrong is skipping the before test, which is how a pre-existing dead GFCI becomes your fault. Anything that requires opening an energized enclosure is qualified-person work under 29 CFR 1910.332 and 1910.399; keep off the wet deck while working at a live panel and do not take that reading in the rain.
Open the light's circuit at its breaker or disconnect, lock and tag it, and prove dead at the deck box on a meter proved on a known live source immediately before and after. Accept when every conductor combination at the deck box reads zero and the meter re-reads correctly on the known source. Wrong is proving dead at a wall switch: a switch loop can be fed from a leg the switch does not open, and a timer or automation output is not an isolating means. Work practices are 29 CFR 1910.333(b)(2), not 1910.147, which excludes electrical utilization work at its own (a)(1)(ii)(C); proving sequence per NFPA 70E-2021, 120.5.
Remove the face screw and ease the fixture out of the niche onto a towel on the deck. Accept when the fixture rests flat on the deck with slack left in the cord and no tension anywhere along it. Wrong is a cord that pulls tight before the fixture clears the coping, which means it was shortened at some point. Stop rule: a short, spliced or damaged cord is a whole-assembly replacement, not a repair, because the cord is part of the listed fixture. Keep a hand under the fixture the whole way up: dropping it takes the lens, and retrieving it happens with the circuit still locked out, never by reaching into water on a live circuit.
Relamp or replace the assembly, and renew the lens gasket every time. Fit the lamp type and rating the fixture is listed for, seat a new gasket in a clean groove, and close the lens clamp to the manufacturer's stated method. Accept when the gasket seats evenly with no twist and the clamp is closed as the instructions specify. Wrong is reusing a flattened gasket, which floods the fixture within a season. Handle a hot lamp with gloves and let an old one cool before removal, and clean up broken lens glass off the deck before it reaches the pool or a bare foot.
Inspect and verify the niche bonding and grounding before anything goes back in. Check the niche's bonding lug and conductor, the equipment grounding conductor at the deck box, and the conduit connection into the niche. Accept when the bonding conductor is landed on a clean lug per the pump and motor replacement SOP's acceptance and a continuity check shows an intact path to the network. Wrong is a lug with the copper corroded green, a conductor that pulls free on a light tug, or an open continuity reading. Stop rule: do not reinstall and do not energize. The circuit stays locked out, the customer is notified in writing that day, and the electrician determines whether the rest of the bonding network is sound before the pool is used.
Reinstall the fixture, coil the cord behind it as the instructions require, and restore the water level above the niche. Accept when the fixture seats square in the niche, the face screw is seated to the manufacturer's method, no cord is pinched between fixture and shell, and the water covers the top of the niche. Wrong is a coil of cord jammed so the fixture will not sit flush. The water level is not cosmetic here: it is what keeps the fixture from overheating the moment it is energized, so it goes back before the lock comes off.
Remove the lock, restore power, and verify the protection you disturbed. Accept when the GFCI trips on its test button and resets, the light operates, and the circuit carries a fifteen minute run with no GFCI or breaker trip, all with the pool still clear of people. Wrong is calling it done at first light. This is the step that puts energy back into a wet niche, so stand on dry deck with dry hands, keep clear of the water surface, and if the GFCI trips at any point during the run, lock the circuit out again and escalate rather than resetting it a second time. Release the pool for swimming only after this step passes.
The record this produces
One light block on the work order, filed to the equipment record for that fixture.
- Arrival state: GFCI trip-and-reset result, light operating or not, trip history reported.
- Isolation: where the circuit was opened, where dead was proved, meter proved before and after.
- Fixture: type, lamp or assembly fitted, cord condition and whether it reached the deck, gasket renewed.
- Niche: bonding lug condition, conductor condition, continuity result, deck box condition and any water in it.
- Return to service: water level restored, GFCI trip-and-reset after work, fifteen minute run result, time the pool was released.
- Disposition: released, or left locked out with the reason and how the customer was notified in writing.
The two GFCI results, before and after, are the pair that protects the shop and the swimmer at once. So is the release time: a written moment when the pool went from closed to open answers the only question that matters if anything happens later.
One light, filled in
A twelve year old line-voltage wet-niche fixture in a residential pool. Complaint: light stopped working. No shock or tingle reported, so step 1 runs as a normal clearance rather than an escalation.
Step 2: GFCI trips on its test button and resets, light dead, no trip history. Step 3: circuit opened and locked at the breaker, proved dead at the deck box with the meter proved live before and after. Step 4: face screw out, fixture eased up and laid on a towel with roughly four feet of cord slack left, so the assembly is intact. Step 5: lamp replaced with the type the fixture is listed for and a new lens gasket seated.
Step 6 fails. The niche bonding lug is corroded, the conductor's strands are green and two have broken at the lug, and a continuity check to the nearest bonded metal component reads open. The stop rule is taken exactly as written: the fixture does not go back in, the circuit stays locked out, and the customer is told in writing that afternoon that the light is dead until an electrician has restored the bond and checked the rest of the network. The customer's fair question is whether the pool is safe to use. The honest answer is the record: the bonding path that limits voltage differences between metal parts around the water is open at the niche, an electrician is booked, and the pool stays out of use until that electrician says otherwise.
The electrician re-lands a conductor on a new lug and reports the path intact by continuity check, with no invented resistance value, per the pump SOP's acceptance.
Steps 7 and 8 then pass on the return visit. Fixture seated square, cord coiled behind it, face screw closed to the manufacturer's method, water restored above the top of the niche before the lock came off. GFCI trips and resets after the work, light operates, and a fifteen minute run passes with no trip. Pool released at that point and the release time written on the ticket.
References
- NEC Article 680, in the edition your jurisdiction has adopted, for underwater luminaires, GFCI protection, cord length, deck box location and equipotential bonding.
- 29 CFR 1910.333(b)(2) for electrical work practices, with qualified-person scope at 1910.332 and 1910.399; 1910.147 excludes electrical utilization work at its own (a)(1)(ii)(C).
- NFPA 70E-2021, 120.5, for the live-dead-live proving sequence.
- The luminaire manufacturer's installation instructions for lamp type, gasket, clamp method and cord routing.
- See related: the pump and motor replacement SOP for the equipotential bonding definition and acceptance; the equipment pad electrical safety inspection SOP for the pad-wide condition check.